[In U.S. over 90 percent of mobile phones are sold through a carrier. Now, however, manufacturers are creating more sales options offering "unlocked" GSM phones.]

By Marguerite Reardon (CNET) -- "The major cell phone operators' hold on which devices U.S. consumers can use on their networks may be slipping as large manufacturers like Motorola and Nokia dabble in selling "unlocked" phones."